Efficient elevator fault self-rescue device

The utility model relates to the technical field of elevator safety, and provides an efficient elevator failure self-rescue device which comprises a brake assembly arranged on the bottom face of a bridge box and electrically connected with an independent power source. In a normal state, the brake assembly is in a contraction state, the independent power supply is communicated with the common circuit, electric energy is kept abundant, and meanwhile operation of the bridge box is not affected. During braking, a braking part in the braking assembly extends out and is fixed to the inner wall of the elevator shaft, so that braking of the axle box is achieved. When a fault occurs, namely the control part of the axle box detects that the speed of the axle box is abnormal, the brake component in the brake component quickly extends out under the action of the pushing mechanism, so that one end of the brake component is clamped and fixed with the inner wall of the elevator shaft, and the brake of the axle box is realiz